Yestderday you saw...
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Yesterday, I thought, was easy. But a lot of people had trouble. The picture showed half of the end view of an AA battery. Commonly used to power toys, torches, the computer mouse etc. I must say the markings on the centre terminal were odd. I had no idea until I looked in the macro lens. They appear in other makes too. I guess the roughness must help the contact.
Special mention to Brian Buccigrossi [@buccigrossi] who even pointed out this is the positive end. (It was a double A, rather than triple A tho' Brian. Grin.)
Well done everyone who had observed batteries in close proximity.
Photographer, writer, teacher :: Live honestly. Progress through knowledge. Achieve by teaching. Communicate in writing. Speak in pictures. Every day, improve the world a little...
what is... a drain p-trap?