Happy Tuen Ng Festival! I'm going to coin 5 festival-related numbers every year!
Rice pudding = 75vvv75 in Down-arrow notation (Class 7: Up-arrow notation level)
Bean paste buns = a*(75, 75 {2 ! 2} 2) in AAN (Class 16: Epsilon level)
Glutinous rice balls = 75[1{1 // 2}2]75 in DLMAN (part 5) (Class 17: Binary phi level)
Egg yolk cakes = L(750000000) in Hyper-L Notation (Class 2)
Taro cakes = H_{ω^21}(75) in Hardy Hierarchy (Class 7: Up-arrow notation level)