How to type special symbols in PTC Creo text editor

When you need to type any special symbol (like a micron in this example) you have to keep your numerical keyboard turned on and  then holding down the left ALT key and enter the number on the numeric keypad as shown below:

for α 224
for ß 225
for Γ 226
for π 227
for Σ 228
for σ 229
for µ 230
for τ 231
for Φ 232
for Ω 234
for δ 235
for ∞ 236
for φ 237
for ε 238
for ∩ 239
for ≡ 240
for ± 241
for ≥ 242
for ≤ 243
for ⌠ 244 (upper half of integration sign)
for ⌡ 245 (lower half of integration sign)
for ÷ 246
for ≈ 247
for ° 248
for √ 251
for ⁿ 252
for ² 253