1epsilon
1epsilon is not a standard term in mathematics. In formal writing, ε (epsilon) is the conventional symbol used to represent a small positive quantity, such as a tolerance or error bound. The combination "1ε" or the phrase “1epsilon” occasionally appears in informal notes or as a typographical variation, but it has no widely accepted independent definition beyond indicating a quantity equal to ε, since 1·ε = ε.
Because 1epsilon is not a formal notation, its interpretation depends on context. In practice, if encountered,
Origins of the form sometimes trace to typographical shortcuts, shorthand notes, or the desire to stress unit-scale