Consider $\mathbb{R}^n$ and, for some $1\leq k\leq n$, the maps $$\operatorname{pr}_k\colon\mathbb{R}^n\to\mathbb{R},\quad(x_1,\dots,x_n)\mapsto x_k,$$ and $$\operatorname{st}_k\colon\mathbb{R}\to\mathbb{R}^n, \quad x\mapsto (0,\dots,0,x,0,\dots,0).$$
$\operatorname{pr}_k$ is called projection, so, does $\operatorname{st}_k$ have a name, too?