It's called a record selector.
You can turn them on and off in the form design properties.
On a continuous form the ➧ block arrow indicates which record you are on, if is being edited (a pencil icon will appear), and if you have the default menus enabled right clicking in it will allow you to cut, copy or delete the record.
DLookup Syntax and others http://access.mvps.org/access/general/gen0018.htm
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↓↓ It's down here ↓↓
oh cool! ty!