Measuring a bicycle chain's pitch can be used to identify chain wear and flag the need for a replacement chain and/or cogs and chainrings. Bicycle Chains: Length, Width, What's Best to Buy etc.
Daith piercing. A Daith piercing (pronounced DÃ¤TH) is an ear piercing that passes through the ear's innermost cartilage fold, the crus of the helix. In most areas this piercing is pronounced day-th which can be compared to the word faith, which is nonstandard. The standard pronunciation is doth like goth.
The theory that 'daith' piercings help ease migraines is based on the idea that it is the same pressure point as that targeted by acupuncturists to relieve chronic headaches. The theory goes that 'daith' piercings relieve migraines, in a similar way to how acupuncture is used to help ease symptoms.