There are lots of different ways to label items so they can be located at a later date.
Products such as braille stickers, bump-ons and tactile markers are available to facilitate this. Devices such as the Penfriend can be used to add personalised audio labels to items and objects. This even works with freezer food.
Using your smartphone
You can buy tags that can be attached to your key ring which interact with your phone and can help to locate your keys, your phone or anything you attach the tag to. The Tile Key Finder can be bought from mainstream retailers.
The RNIB Shop sells a variety of different products to help with labelling.