It’s an H. Because the character H starts with a vowel sound (aitch), we use the indefinite article "an".

It’s an H. Because the character H starts with a vowel sound (aitch), we use the indefinite article "an".

That word should be written with an h.

That word should be written with a h.

Another example:

My husband has an H-4 visa.

Be aware that the choice between a and an depends on the initial sound of the following word, and not how it's spelled; thus, use "an" before vowels and consonants that are pronounced with a vowel sound, like F, H, L, M, N, R, S, and X.

An X means that the task was completed,

We also use "an" to pronounce abbreviations starting with "H" as separate letters. For example, we say:

• an HDL (High-Density Lipoprotein)
• a/an HDD (Hard Disk Drive)
• an HDMI (High-Definition Multimedia Interface)
• an HIV (Human Immunodeficiency Virus)
• an HPV (Human Papilloma Virus)
• an HTML (HyperText Markup Language)
• an HTTP (HyperText Transfer Protocol)

Your doctor can use an HDL test to check your cholesterol levels.

Other acronyms, however, like HW (Hardware) or Hz. (Hertz), are usually pronounced as words. In such a situation, use "a" if the word starts with a consonant sound. For example, we say a HW...

Do you have a HW support service contract?