Let $X$ be a topological space, let $x\in X$ and let $\pi_1 (X,x)$ be the fundamental group of $X$ with basepoint $x$.
Is there a standard notation for the trivial (constant) loop in $\pi_1 (X,x)$?
Generally speaking, I would denote the identity element of a group $G$ by $1_G$, but it seems cumbersome to write $1_{\pi_1 (X,x)}$ of course.
I also see loops typically denoted with Greek letters, so do most people just declare something like, "let $\gamma \in \pi_1 (X,x)$ be the (homotopy equivalence class of the) trivial loop", or is there a standard notation for this?