Because symbols are the only primitive data type that has reference identity (that is, you cannot create the same symbol twice), they behave like objects in some way. For example, they are garbage collectable and can therefore be stored in WeakMap, WeakSet, WeakRef, and FinalizationRegistry objects.

Because registered symbols can be arbitrarily created anywhere, they behave almost exactly like the strings they wrap. Therefore, they are not guaranteed to be unique and are not garbage collectable. Therefore, registered symbols are disallowed in WeakMap, WeakSet, WeakRef, and FinalizationRegistry objects.


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In MDN and other sources, well-known symbol values are stylized by prefixing @@. For example, Symbol.hasInstance is written as @@hasInstance. This is because symbols don't have actual literal formats, but using Symbol.hasInstance does not reflect the ability of using other aliases to refer to the same symbol. This is like the difference between Function.name and "Function".

Well-known symbols do not have the concept of garbage collectability, because they come in a fixed set and are unique throughout the lifetime of the program, similar to intrinsic objects such as Array.prototype, so they are also allowed in WeakMap, WeakSet, WeakRef, and FinalizationRegistry objects.

In MDN and other sources, well-known symbol values are stylized by prefixing @@. For example, Symbol.hasInstance is written as @@hasInstance. This is because symbols don't have actual literal formats, but using Symbol.hasInstance does not reflect the ability of using other aliases to refer to the same symbol. This is like the difference between Function.name and \"Function\".

Kwanzaa has seven basic symbols and two supplemental ones. Each represents values and concepts reflective of African culture and contributive to community building and reinforcement. The basic symbols of Swahili and the in English are:

Furthermore, dynamic symbols allow each symbol instance to have a unique appearance while sharing a common base shape. Changes made to the base shape are applied automatically to each instance while maintaining their unique appearance.


Before starting with symbols, familiarize yourself with the Symbols panel (Window > Symbols). The Symbols panel lets you create and manage symbols in your document. The Symbols panel contains both preset symbols and any symbols you create. You can also add more symbols from libraries to the Symbols panel.

Symbol libraries are collections of preset symbols. To open a symbol library, select Symbol Libraries Menu on the Symbols panel, and then select a library from the list. To add a symbol from a library to the Symbols panel, select the symbol.

Add all the required symbols from libraries to the Symbols panel. To add multiple symbols from a library to the Symbols panel, Shift-select the symbols and then select Add to Symbols from the library menu.

A collection of configurable animations provide a new dimension of expression across the entire symbol library. Choreographed behaviors such as appear, bounce, scale, pulse, and more define how symbols and their layers move. These animated effects and transitions bring vitality to interfaces and provide feedback to user input while communicating changes in status and ongoing activity.

New symbols include automotive indicators, game controller buttons, additional weather conditions, currencies, and more. New localized symbols include variants across Arabic, Chinese, Devanagari, Hebrew, Japanese, Korean, Latin, and Thai. These new symbols are available in apps running iOS 17, iPadOS 17, macOS Sonoma, tvOS 17, and watchOS 10.

Creating custom symbols is faster and easier with symbol components: a library of enclosure shapes, badges, and slashes that can be added to custom symbols. Updated annotation tools and a new inspector enable animation previews for both system and custom symbols.


I have a shapefile with lots of points in it. I perform a table join and only keep matching records. I try to use graduated symbols based on a double field in the joined table and the symbols disappear from the map. Anybody else have this problem?

I go into symbology, set up graduated symbols, everything looks great on the preview screen. I hit apply/ok and the points disappear from my map. The the identify tool recognizes them but there is no symbol on the map.

Textsymbols.net helps you to copy and paste text symbols online.It is a free tool to copy text symbols, text emoji on click. It also comes with different categoriesofsymbolsthat helps to find text symbols, and emoji which you want.Choose your types of symbols and Just click on a symbol to copy it to the clipboard & insertitto an input element.

If you are using symbols on a remote symbol server, you can improve performance by specifying a local directory that symbols can be copied to. To do this, type a path in the Cache symbols in this directory box. If you are debugging a program on a remote computer, the cache directory refers to the directory on the remote computer.

The idea of stopping and restarting VS 2010 worked for me for the same problem. However, I had to open a different and unrelated solution, close that one and reopen the solution with the debug symbols problem. All is now well.Hope this helps.

I had a similar issue where i used a configtransform in a web project. Even though i set my configtransform to not remove the compilation debug=true, and enabled define DEBUG constant, i was not able to make it generate the debug symbols when in a certain compilation mode.

A bit late here but I just Googled a similar issue and I came straight here. I'm using VS2010(c++) and had a similar issue with a bug only seen in a Release build.My fix to get the symbols loaded was to ask VS2010 to create and load them :-)

SolutionExplorer->ProjectName - Right click and select Properties.In the property page, at the top, confirm the correct configuration and platform that you are about to change the properties, for me I wanted Release and x64. Open up the Linker->Debugging, in the properties pane there is an option to 'Generate Debug Info' - change this to 'Yes'. Rebuild and the debug symbols are generated and loaded for debugging. You can selectively do this for each project in the solution.

I had this issue. I tried everything, rebuild all, restarting VS, restarting machine, etc. I finally figured it out, and the issue is extremely annoying. The debug dropdown, which contains "Debug", "Release" showed "Debug" the entire time I troubleshooted this issue. However, it appears that it was attempting in release. With it already set to Debug, I opened the dropdown menu, selected Debug, and then started again and symbols were loaded successfully.And again, this is after attempting to restart computer and everything. And visual studio loads with the dropdown defaulted to "Debug" yet I have to select it from the dropdown anyway.:@

When I first came to Clojure from Common Lisp, I was puzzled why it treats symbols and keywords as separate types, but later I figured it out, and now I think it is a wonderful idea. Now I am trying to puzzle out why symbols and vars are separate objects.

Symbols themselves are just names, while vars are the value-carrying entities and don't themselves have names. If extend the earlier example and say (def y x), I haven't created a new var, I've just given my existing var a second name. The two symbols x and y are both names for the same var, which has the value of 1.

For one thing, not all symbols are bound to vars. In local contexts, such as function arguments or let bindings, the value referred to by a symbol in your code isn't actually a var at all - it's just a local binding that will be optimized away and transformed to raw bytecode when it hits the compiler.

But if (def x 1) is a list, than what are the values in the list? And particularly, what are the types of those values? Obviously 1 is a number. But what about def and x? What is their type, when I'm manipulating them as data? The answer, of course, symbols.

And that is the main reason symbols are a distinct entity in Clojure. In some contexts, such as macros, you want to take names and manipulate them, divorced from any particular meaning or binding granted by the runtime or the compiler. And the names must be some sort of thing, and the sort of thing they are is symbols.

After giving this question a lot of thought, I can think of several reasons to differentiate between symbols and vars, or as Omri well put it, to use "two levels of indirection for mapping symbols to their underlying values". I will save the best one for last...

This connects to the point some posters made, that symbols can also refer to Java classes in Clojure. If symbols carried bindings with them, those bindings could just be ignored in contexts where the symbol refers to a Java class, but it would be messy conceptually.

3: In (probably rare) cases where symbols are used as map keys, etc., and perhaps even returned by an API, the equality semantics of Clojure's symbols are more intuitive than CL's symbols. (See @amalloy's answer.) ff782bc1db

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