### 3.1.119 SystemStartSquare

SystemStartSquare objects are created by: System_start_delimiter_engraver.

Standard settings:

> `direction` (direction):

>   `-1`

>   If `side-axis` is `0` (or `X`), then this property determines whether the object is placed `LEFT`, `CENTER` or `RIGHT` with respect to the other object. Otherwise, it determines whether the object is placed `UP`, `CENTER` or `DOWN`. Numerical values may also be used: `UP`=`1`, `DOWN`=`-1`, `LEFT`=`-1`, `RIGHT`=`1`, `CENTER`=`0`.

> `stencil` (stencil):

>   `ly:system-start-delimiter::print`

>   The symbol to print.

> `style` (symbol):

>   `'line-bracket`

>   This setting determines in what style a grob is typeset. Valid choices depend on the `stencil` callback reading this property.

> `thickness` (number):

>   `1.0`

>   Line thickness, generally measured in `line-thickness`.

> `X-offset` (number):

>   `ly:side-position-interface::x-aligned-side`

>   The horizontal amount that this object is moved relative to its X-parent.

This object supports the following interface(s): font-interface, grob-interface, side-position-interface, spanner-interface and system-start-delimiter-interface.

#### Internals Reference v2.18.2 (稳定分支).