{{alias}}( [ch] )
    Returns the data type string associated with a provided single letter
    character abbreviation.

    If not provided an abbreviation, the function returns an object mapping
    single letter character abbreviations to data type strings.

    If provided an unknown/unsupported abbreviation, the function returns
    `null`.

    Parameters
    ----------
    ch: string (optional)
        Single letter character abbreviation.

    Returns
    -------
    out: Object|string|null
        Data type string.

    Examples
    --------
    > var out = {{alias}}( 'd' )
    'float64'
    > out = {{alias}}( 'foobar' )
    null
    > var obj = {{alias}}()
    {...}

    See Also
    --------