MQL5:
https://www.mql5.com/en/docs/constants/environment_state/marketinfoconstants#enum_symbol_info_double
MQL4:
https://docs.mql4.com/constants/environment_state/marketinfoconstants
Regards.

Documentation on MQL5: Standard Constants, Enumerations and Structures / Environment State / Symbol Properties
- www.mql5.com
Standard Constants, Enumerations and Structures / Environment State / Symbol Properties - Reference on algorithmic/automated trading language for MetaTrader 5

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When Locking in help MQL5 Reference it says:
TickSize: Minimal change of prize
TickValue: Minimal change of prize
Made me choose the wrong one when my head was full of logic and variables
TickSize: Minimal change of price in units
TickValue: Minimal change of price in money