ANSI/IEEE Std 260.4-1996 American National Standard Letter Symbols and Abbreviations for Quantities Used in Acoustics -Description

Abstract: Letter symbols for physical quantities used in the science and technology of acoustics are covered. Abbreviations for a number of acoustical levels and related measures that are in common use are also given. The symbols given in this standard are intended for all applications.

Keywords: abbreviations, acoustical levels, acoustics, infrasound, letter symbols, physical quantities, sound, sound levels, symbols, ultrasound, units, vibration

Content

• 1. Overview
• 2. References
• 3. General principles of letter symbol standardization
• • 3.1 Letter symbols
  • 3.2 Alphabets and typography
  • 3.3 Remarks concerning quantity symbols
  • 3.4 Remarks concerning unit symbols
  • 3.5 The International System of Units (SI)
  • 3.6 Usage
  • 3.7 Unit symbols to be used with limited character sets
• 4. Principles applicable to letter symbols and abbreviations for quantities used in acoustics
• • 4.1 Time-varying quantities
  • 4.2 Average values
  • 4.3 Quantities per unit volume, area, or length
  • 4.4 Sequence for double subscripts to multiplying operators
  • 4.5 Remarks concerning levels
  • • 4.5.1 Notation for expressing the reference of a level
    • 4.5.2 Indication of the weighting of a level
    • 4.5.3 Sequence of subscripts for a level
  • 4.6 Remarks concerning abbreviations
  • • 4.6.1 Use of abbreviations
    • 4.6.2 International use
    • 4.6.3 Mathematics
    • 4.6.4 Sequence of letters in an abbreviation
    • 4.6.5 Invariance of form
    • 4.6.6 Subscripts
    • 4.6.7 Punctuation
    • 4.6.8 Additional abbreviations
• 5. Introduction to the tables
• 6. Bibliography

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