How much does a dash equal in terms of teaspoon measurement?

A dash is commonly understood in cooking and measurement to represent a small amount of an ingredient, specifically reflecting an informal way to measure quantities used in recipes. In terms of teaspoon measurement, a dash typically equates to 1/8 of a teaspoon. This measurement is used when a precise amount is not critical, allowing for some flexibility. The other options represent different quantities that do not accurately reflect the traditional measurement associated with a dash. Therefore, recognizing that a dash equals 1/8 of a teaspoon aligns with the customary culinary practice.