The tau symbol is a letter in the Greek alphabet, represented by an uppercase Τ and a lowercase τ.
According to the provided reference, the Greek alphabet includes the following letters:
| Letter | Uppercase | Lowercase |
|---|---|---|
| Pi | Π | π |
| Rho | Ρ | ρ |
| Sigma | Σ | σ |
| Tau | Τ | τ |
Therefore, τ is the lowercase form of the Greek letter Tau.
