User blog comment:Ikosarakt1/BEAN is much stronger/@comment-84.107.139.241-20130712111505/@comment-5150073-20130712160445

I haven't seen where \_[3] symbol is defined. There are two similar symbols: \_3 and \[3]. I figured out that {LLL...LLL,1}X,X, it's comparable to [1 [1 \\ 3] 2]. Note that it isn't limit of BEAN, as it is just a line of L's. There must be ordinal for square of L's, cube of L's, ..., L array of L's, etc.