I/O icon

[rodrigogomesantos]

Before submitting a new icon request, please confirm the following:

• [x] I have searched all issues to make sure there isn't a request for this icon.
• [X] I have searched the current library to make sure the icon doesn't already exist.
• [X] I understand that brand icons are no longer being added and I can use SimpleIcons for my brand icon needs.
• [X] I only intend to request a single icon (or a few near-identical ones) in this issue.

What would you use this icon for?

I'm developing a system based on node(visual development), where I can control generic boards that run Firmware Marlin or any one that can run gcode. these icons would be useful to illustrate the output and input ports.

Give us an example of what this icon might look like.

https://res.cloudinary.com/crunchbase-production/image/upload/c_lpad,h_170,w_170,f_auto,b_white,q_auto:eco,dpr_1/cey5elk9t8rotbvask4b