What does "f" mean on company logo?

On practice Invest account and just noticed letter “f” in blue circle appearing, superimposed over company logo-anyone know what this means?

It means that is a Fractional share. You can buy subunits of 1.

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Thanks so much for getting back to me, I’m clueless about most of the icons unique to this site. I asked for a key, (+suggested as topic for next YouTube vid), hoping 1 of the admins’d see it, but no dice up to yet. Appreciate your swift answer.