In a text, you can have some symbols associated with their unicode characters.
You can find the mapping between the name of the symbol and the unicode value here :

Symbol Name	Unicode Name	UNICODE Code Point
Plus-Minus Sign	PLUS-MINUS SIGN	U+00B1
Greek Capital Omega	GREEK CAPITAL LETTER OMEGA	U+03A9
Greek Small Omega	GREEK SMALL LETTER OMEGA	U+03C9
Center Line	CENTRE LINE SYMBOL	U+2104
Circular Runout	NORTH EAST ARROW	U+2197
Depth/Deep	DOWNWARDS ARROW FROM BAR	U+21A7
Angularity	ANGLE	U+2220
Parallelism	PARALLEL TO	U+2225
Less-Than or Equal To Sign	LESS-THAN OR EQUAL TO	U+2264
Greater-Than or Equal To Sign	GREATER-THAN OR EQUAL TO	U+2265
Plug Weld Symbol	SQUARE CAP	U+2293
Diameter	DIAMETER SIGN	U+2300
Profile of a Line	ARC	U+2312
Profile of a Surface	SEGMENT	U+2313
Position	POSITION INDICATOR	U+2316
Convex Weld Symbol	FROWN	U+2322
Cylindricity	CYLINDRICITY	U+232D
Symmetry	SYMMETRY	U+232F
Total Runout	TOTAL RUNOUT	U+2330
Conical Taper	CONICAL TAPER	U+2332
Slope	SLOPE	U+2333
Counter Bore	COUNTERBORE	U+2334
Counter Sink	COUNTERSINK	U+2335
Concentricity/Coaxiality	APL FUNCTIONAL SYMBOL CIRCLE JOT	U+233E
Straightness	STRAIGHTNESS	U+23E4
Flatness	FLATNESS	U+23E5
Modifier A	CIRCLED LATIN CAPITAL LETTER A	U+24B6
Envelop Condition	CIRCLED LATIN CAPITAL LETTER E	U+24BA
Free State Condition	CIRCLED LATIN CAPITAL LETTER F	U+24BB
Independency	CIRCLED LATIN CAPITAL LETTER I	U+24BE
Least Material Condition	CIRCLED LATIN CAPITAL LETTER L	U+24C1
Maximum Material Condition	CIRCLED LATIN CAPITAL LETTER M	U+24C2
Projected Tolerance Zone	CIRCLED LATIN CAPITAL LETTER P	U+24C5
Reciprocity	CIRCLED LATIN CAPITAL LETTER R	U+24C7
Regardless of Feature Size	CIRCLED LATIN CAPITAL LETTER S	U+24C8
Tangent Plane	CIRCLED LATIN CAPITAL LETTER T	U+24C9
Unequally	CIRCLED LATIN CAPITAL LETTER U	U+24CA
Square	WHITE SQUARE	U+25A1
PMI Separator	BLACK DIAMOND	U+25C6
Circularity/Roundness	LARGE CIRCLE	U+25EF
Fillet Weld Symbol	RIGHT TRIANGLE	U+25FA
Perpendicularity	PERPENDICULAR	U+27C2
Statistical Tolerance	INSERT STATISTICAL	U+F055
Between	INSERT BETWEEN	U+F056
Fit Function	FIT FUNCTION	U+F058
Safety Compliance	INSERT SAFETY COMPLIANCE	U+F059
Insert Sphere	INSERT SPHERE	U+F060
Insert Left Pitch	INSERT LEFT PITCH	U+F061
Insert Right Pitch	INSERT RIGHT PITCH	U+F062
Insert Left Taper	INSERT LEFT TAPER	U+F063
Insert Right Taper	INSERT RIGHT TAPER	U+F064
Insert Quantity	INSERT QUANTITY	U+F065
Spot Face	INSERT SPOT FACE	U+F100
Continuous Feature	INSERT CONTINUOUS FEATURE	U+F101
Two-point Size	TWO-POINT SIZE	U+F102
Local Size Defined by Sphere	LOCAL SIZE DEFINED BY SPHERE	U+F103
Least Square Associated	LEAST SQUARE ASSOCIATED	U+F104
Maximum Inscribed Association Criteria	MAXIMUM INSCRIBED ASSOCIATION CRITERIA	U+F105
Minimum Circumscribed Association Criteria	MINIMUM CIRCUMSCRIBED ASSOCIATION CRITERIA	U+F106
Circumference Criteria	CIRCUMFERENCE CRITERIA	U+F107
Area Diameter	AREA DIAMETER	U+F108
Volume Diameter	VOLUME DIAMETER	U+F109
Maximum Size	MAXIMUM SIZE	U+F10A
Minimum Size	MINIMUM SIZE	U+F10B
Average Size	AVERAGE SIZE	U+F10C
Median Size	MEDIAN SIZE	U+F10D
Mid-range Size	MID-RANGE SIZE	U+F10E
Range Size	RANGE SIZE	U+F10F
Insert Standard Deviation of Sizes	INSERT STANDARD DEVIATION OF SIZES	U+F110
Insert Two-line Angular Size with Minimax Association Criterion	INSERT TWO - LINE ANGULAR SIZE WITH MINIMAX ASSOCIATION CRITERION	U+F111
Insert Two-line Angular Size with Leasts Squares Association Criterion	INSERT TWO - LINE ANGULAR SIZE WITH LEASTS SQUARES ASSOCIATION CRITERION	U+F112
Insert Minimax(Chebyshev) Association Criteria	INSERT MINIMAX( CHEBYSHEV ) ASSOCIATION CRITERIA	U+F113
Insert Orientation Constraint	Insert Orientation Constraint	U+F114