1B

1B may refer to:

Science and technology

• Alpha-1B adrenergic receptor
• Arginine vasopressin receptor 1B
• Interferon beta-1b
• Melatonin receptor 1B
• The ASCII hexadecimal code for the escape character
• 1b as one billion

Sport

• First baseman
• Single (baseball)

Transport

• Axle arrangement on steam locomotives corresponding to a 2-4-0 wheel arrangement
• GCR Class 1B, a class of British 2-6-4T steam locomotive
• National Highway 1B (India, old numbering)

See also

• B1 (disambiguation)
• Billion