StarReLU
StarReLU
$s \cdot (\mathrm{ReLU}(x))^2 + b$

where $s \in \mathbb{R}$ and $b \in \mathbb{R}$ are shared for all channels and can be set as constants (s=0.8944, b=-0.4472) or learnable parameters.
MetaFormer Baselines for Vision
https://paperswithcode.com/paper/metaformer-baselines-for-vision
MetaFormer Baselines for Vision