There are two ways in which the morphological types can be written: either the Hubble class (sprials, ellipticals, etc), or as a numeric value between -6 and +11 (de Vaucouleurs). The correspondance between the two scales is detailed in the last column.
The Hubble morphological class is written in Simbad as essentially 2 parts:
The morphology: elliptical E (E0...E9) -4...-3 spiral S (S0, Sa...Sd, Sm) -2...+9 barred spiral SB (SB0, SBa...Sd, SBm) -2...+9 irregular I +10...+11 The peculiarities: (before or after the morphological class) c compact -6(cE), +11 (cI) d dwarf -5(dE) ringed r open spiral s peculiar p
The colon (:) indicates an uncertainty on the preceding symbol, e.g. S: means probably a Spiral, SB: means a spiral with a probable bar, and S:B: means probably a barred spiral.
In Simbad, two morphological classes may exist, separated by a slash, as E/S0 (elliptical or lenticular).