In linguistics we often need to use the following symbols in text-mode. So I added the following commands, but some time ago I came to know about egreg's "`\ensuremath`-only-when-really-needed" campaign :P. I kinda got his point. Now I am not sure whether the following commands from `linguistix` are of any use. If I want to get those shapes without invoking the math-mode, what can be the alternative ways?

```
\DeclareTextCommand{\textnull}{TU}{$\varnothing$}
\DeclareTextCommand{\textnull}{OT1}{$\varnothing$}
\DeclareTextCommand{\textnull}{T1}{$\varnothing$}
\DeclareTextCommand{\textempty}{TU}{$\emptyset$}
\DeclareTextCommand{\textempty}{OT1}{$\emptyset$}
\DeclareTextCommand{\textempty}{T1}{$\emptyset$}
```