Sometimes I don’t want to alarm my non-Muslim colleagues or members of my community when they turn the corner of a shopping mall or open a door in the office and they see me bowing or prostrating l, so i sometimes prepare a folded paper-stand with my handwriting that says “Just praying :)” beside me.
Maybe: with one button, the app displays a background, brightly illuminated, that says “Just Praying :)”
Going one step further, this background can share messaging:
“Just praying :)”
“This should last 7 minutes :)”
And going one step further is to explain prayer.