How do I get rid of the letter p that moves around to the end of blocks of text and if you click it shows a box that allows you to publish?

It's a grey-ed lower case p that moves with the cursor to the end of paragraphs or stand alone sentences, ie doesn't move word by word or letter by letter. If I click it I get a box the at the top has OP RTV US and at the bottom of the box the word PRINT and the option to share.