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A complete solution has been found for the methods of entering symbols for grades 1, 2, 3, and 4 of rebar; those who use CAD for drawing no longer need to go through the hassle of searching for these symbols! Address: http://www.jzcad.com/bbs/viewthread.php?tid=21730. The character codes are as follows: Code | Description 130 | Symbol for grade 1 rebar 131 | Symbol for grade 2 rebar 132 | Symbol for grade 3 rebar 133 | Symbol for grade 4 rebar 134 | Symbol for grade 5 rebar 142 | Square 143 | Cube 145 | Percent sign ‰ 147 | Angle ∠ 148 | Greater than or equal to ≥ 149 | Less than or equal to ≤ 152 | Draw a small circle around the preceding digit 153 | Draw a circle around the preceding two digits 154 | Draw a large circle around the preceding digit 158 | Triangle △ 160 | Subscript 161 | Restore subscript format 162 | Superscript 163 | Restore superscript format 164 | Sigma σ 167 | Reduce the size of the text following by 1/2 168 | Increase the size of the text following by 1/2 171 | Roman numeral I 172 | Roman numeral II 173 | Roman numeral III 174 | Roman numeral IV 175 | Roman numeral V 176 | Roman numeral VI 190 | Prestressed rebar 191 | Prestressed rebar in civil engineering. Note: 1. Subscripts and superscripts must be used in pairs; for example, A squared should be written as A%%1622%%163. This way, the size of the text following it will return to normal. If a character with a subscript or superscript is used alone, without any other characters following it, then the %%161 (or %%163) can be omitted. 2. When using circled characters, if the text intended to be displayed should be of the same size as Chinese characters and all characters used are single-digit numbers, then %%152 should be used. For circled characters with two digits, %%167 can be added in front of the number to reduce its size; finally, %%168 is used to restore the size of the text that follows it. For example: %%1672%%15423%%154%%168 ； If writing the enclosed character separately, only %%154 or %%153 can be used.