Factorio-Paranoidal_mod/flib_0.13.0/docs/sprites.md

The following are sprites provided by flib for your use:

Indicator sprites

As seen above, indicator sprites are used to display the "status" of something. They are 16x16 in size, and are intended to be accompanied by a status label. The sprite names follow the flib_indicator_COLOR pattern, replacing COLOR with the corresponding color as shown in the preview above (e.g. flib_indicator_blue).

To align the indicator with an adjacent label, create both the indicator and label as children of a flow with the flib_indicator_flow style (see gui-styles.md).