Identifying this ?jade pendant

[Snowdrop13]

Hello everyone. This pendant was in my mother in law’s jewellery box and I’m wondering what it is? She was born in Thailand and had family who lived in Malaysia, this was all 1930’s era. Is it jade? I’m not sure of the terminology. Also, can anyone tell me what the symbols mean? I think it probably needs a good clean now I see the close ups!