A
- arr: array
B
- btn: button
C
- cat: category
- cls: class
- cnt: count
- cur: current
E
- elm: element
- err: error
M
- msg: message
O
- obj: object
P
- pos: position
R
- req: request
- res: response
- ret: return / result
S
- str: string
T
- tmp: temporary
V
- val: value
X
- xhr: XMLHttpRequest