>>19412174
>#
Number sign
Algebraic notation for chess: A hash after a move denotes checkmate.
Linguistic syntax: A hash before an example sentence denotes that the sentence is semantically ill-formed, though grammatically well-formed. For instance, "#The toothbrush is pregnant" is a grammatically correct sentence, but the meaning is odd.
Medical shorthand: The hash is often used to indicate a bone fracture.[56] For example, "#NOF" is often used for "fractured neck of femur". In radiotherapy, a full dose of radiation is divided into smaller doses or 'fractions'. These are given the shorthand # to denote either the number of treatments in a prescription (e.g. 60Gy in 30#), or the fraction number (#9 of 25).
Scrabble: Putting a number sign after a word indicates that the word is found in the British word lists, but not the North American lists.[
the Chinese character for "well" ไบ
https://en.wikipedia.org/wiki/Number_sign