One or two bars under a care symbol, calling for a gentler process.
A bar under a care symbol asks for a reduced mechanical action; two bars ask for a much gentler one. The bars modify whichever symbol they sit beneath rather than meaning anything on their own.
In the ISO 3758 system a single bar beneath a symbol calls for reduced mechanical action, and a double bar for much reduced action.
Contexts: Laundry
A modifier rather than an instruction: the bars have no meaning apart from the symbol they are drawn under.
Contexts: Laundry
One or two short horizontal strokes set beneath another symbol, level with one another and centred under it.
Both are built from lines and dots, and both are used in laundry contexts.