In $\sqrt {f}$, $f$ is the radicand.
In $\sum g_i$, $g_2$ is a summand.
In $x \times y \times z$, $y$ is a multiplicand.
In: $$\displaystyle \lim_{n \to +\infty} h_n(x)$$ or: $$h(x) \to \ell \quad \text {as} \quad x \to c$$
What's "$h$" called? The limitand?