FMAs
In the context of the FMAs on Airbus PFDs, SRS = Speed Reference System.
Haven't flown the A330, but Airbuses generally have 3 fields of FMAs, positioned at the top of the PFD display. From left to right, they are: Thrust; vertical (pitch); horizontal (roll).
It is common to see "FLEX - SRS - RWY" at the beginning of the take-off run. "SRS" means that, once the aeroplane has left the ground, the initial vertical (pitch) mode of the flight director will give pitch-bar commands to achieve V2+15 (all-engine) or V2 (engine-out). At the acceleration altitude (often the same as the thrust-reduction altitude, but not necessarily so), SRS mode will automatically change to one of the climb modes, using pitch change to accelerate to, and then maintain, the appropriate climb speed ("selected" or "managed").
[The above is from memory, so terminology may not be as per the current FCOMs. "FMA" = Flight-Mode Annunciator.] Hope this helps.