Hi & Welcome to the Board!
ou can use the CODE function to determine what the code number of the character is eg:
assuming the character is in a string in A1 (adjust Mid settings to suit). If the character is on its own, you can omit the Mid.
This assumes that it is from the default character set (ie 0 which is the setting for all Western (ANSI) settings). I suspect it is a specific font giving rise to the character.
See what the CODE returns and report back.