The abbreviation for nanometer is "nm". No Greek letters are used in this case.
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That's pi, the sixteenth letter of the Greek alphabet. In mathematics, it is defined as the numerical value of the ratio of the circumference of a circle to its diameter.
Pi is the 16th letter of the Greek alphabet and it represents the value of the circumference of a circle divided by its diameter which is an irrational number.
A letter. It may be upper or lower case, Roman or Greek alphabet, or indeed from other alphabets.
1 nanometer=1.0510-9
Nanometer is definitely smaller then a meter.