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# Name a Data Stream Instance

The general syntax for naming a data stream instance is:

`StreamX`

where:

`Stream` | is the prefix for the type of data stream.
X | is the instance number. The instance number cannot begin with the digit `0`. The number is optional–an instance without an assigned number is still treated as unique and different from other instances that have numbers.

For example, `w1` represents the instance ‘1’ of the word label stream. `f3` represents the instance ‘3’ of the speech frame stream.

This table contains a complete list of the available data stream types.

Data stream type | Prefix
--- | ---
Audio sample–mono | `a`
Audio sample–left channel | `l`
Audio sample–right channel | `r`
Feature frame–unnormalized feature | `f`
Feature frame–normalized feature | `nf`
Word tag (for example, recognition result) | `w`
Language identification feature | `lf`
Language identification result | `lid`
Language identification boundary point information | `lb`
Speaker identification output results | `sid`
Audio fingerprint feature data | `fp`
Audio fingerprint identification data (identified track records) | `tr`
Phone data for phrase matching | `p`
Score data for phrase matching | `s`
File label boundaries | `fl`
Time shift data | `ts`

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