What does one red line through the weapon mean?

What does one red line through the weapon mean? - Top view of palette of vibrant colorful lines with different shades in row forming abstract background

I can see that the red cross thought the weapon icon means that you can`t wield it. but what about the 1 red line over the weapon icon?

salt-and-sanctuary

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What does one red line through the weapon mean? - Hurdle painted in white black and red colors placed on empty rubber running track in soft focus

What does one red line through the weapon mean? - Red Light Beams

What does one red line through the weapon mean? - Person Holding White Plastic Hair Comb

Russia-Ukraine war: Rising fears that Putin may cross red line with nuclear weapons

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