Hi blue lotus (that's 'nil-maanel' in Sinhalese by the way
Sota - apanna : stream - enterer,
Sota - apatti : the state of stream-entry
'Sota, sota what is the Sota' Ven Sariputta asks: 'the Noble eightfold path' is the correct reply.
Stream entrant has fulfilled Sila (morality) training and attained to right view. They have some degree of right effort, mindfulness and right concentration. They know that the four noble truths are true experientially, hence the fetter of doubt has fallen away and have unshakeable faith in the Buddha, his teachings (the dhamma) and those who practice accordingly and reach higher attainments (the sangha). The latter are defined as those who have reached the higher 'paths and fruits'.