IEEE Std 854-1987, the Standard for radix-independent floating-point arithmetic, was the first Institute of Electrical and Electronics Engineers

Institute of Electrical and Electronics Engineers

The Institute of Electrical and Electronics Engineers is a non-profit professional association headquartered in New York City that is dedicated to advancing technological innovation and excellence...

 (IEEE) standard

International standard

International standards are standards developed by international standards organizations. International standards are available for consideration and use, worldwide...

 for floating-point arithmetic with radix

Radix

In mathematical numeral systems, the base or radix for the simplest case is the number of unique digits, including zero, that a positional numeral system uses to represent numbers. For example, for the decimal system the radix is ten, because it uses the ten digits from 0 through 9.In any numeral...

 2 or radix 10 (not more general than that, despite the title).

The standard was published in 1987, nearly immediately superceeded by IEEE 754-1985 but never terminated (the year of ratification appears after the dash).
IEEE 854 did not specify any formats, whereas IEEE 754-1985 did.
IEEE 754 specifies floating-point arithmetic for both radix 2 (binary

Binary numeral system

The binary numeral system, or base-2 number system, represents numeric values using two symbols, 0 and 1. More specifically, the usual base-2 system is a positional notation with a radix of 2...

) and radix 10 (decimal

Decimal

The decimal numeral system has ten as its base. It is the numerical base most widely used by modern civilizations....

), including specifying two alternative formats for radix 10 floating-point values.
IEEE 754-1985 was only superseded in 2008 by IEEE 754-2008.
IEEE 754-2008 also has many other updates to the IEEE floating point standardisation.