Is it an special or a special?

The correct way to use this Word as an adjective with an indefinite article (a or an) is "a special." You can discern whether to use 'a' or 'an' before a noun or adjective by noting the sound that the Word starts with. If a Word starts with a consonant, its proper indefinite article would be 'a,' such as "a car" or "a movie." Conversely, if a Word starts with a vowel, its proper indefinite article would be 'an,' like "an octopus" or "an Apple." The exception to this rule applies to Words that sound like they begin with a vowel, even though their spelling begins with a consonant. For example, you would say "an hour" instead of "a hour" because the 'h' in 'hours' is silent.