You can choose all symbols for geometric tolerances or limit symbols to a
standard with the
Allow tolerance symbols for all drafting
standards option.
For
example, if you select the ISO standard and clear Allow
tolerance symbols for all drafting standards, you limit the symbols
and values to ISO standards.
If you select Allow tolerance symbols for all drafting standards,
all symbols and values are available regardless of the tolerancing standard.
To limit geometric tolerances to a standard: