The best symbol for non-negative integers? I would like to specify the set $\{0, 1, 2, \dots\}$, i.e., non-negative integers in an engineering conference paper. Which symbol is more preferable?

*

*$\mathbb{N}_0$

*$\mathbb{N}\cup\{0\}$

*$\mathbb{Z}_{\ge 0}$

*$\mathbb{Z}_{+}$

*$\mathbb{Z}_{0+}$

*$\mathbb{Z}_{*}$

*$\mathbb{Z}_{\geq}$

According to Wikipedia, unambiguous notations for the set of non-negative integers include
$$
\mathbb{N}^0 = \mathbb{N}_0 = \{ 0, 1, 2, \ldots \},
$$
while the set of positive integers may be denoted unambiguously by
$$
\mathbb{N}^* = \mathbb{N}^+ = \mathbb{N}_1 = \mathbb{N}_{>0}= \{ 1, 2, \ldots \}.
$$
