sizeof()

sizeof(type|variable)

Determines the size of a data type or allocated variable.

.var fp8.8[256], TrigTable

.echoln sizeof(fp8.8)     ; Outputs 2, as 8 bits + 8 bits = 16 bits = 2 bytes.
.echoln sizeof(TrigTable) ; Outputs 512, as sizeof(fp8.8) * 256 = 512 bytes.